(The Nation Multimedia.com 05-17-2013) Thailand-The rainy season will be the first real test for the artificial reefs placed in shallow waters along the coast of Phetchaburi's Cha-am district as they begin their mission of preventing coastal erosion. The reefs, which are partially made from lignite fly ash, were placed along the coastline on Wednesday. "This artificial reef will have to prove itself," community leader Chairat Tabtong said, adding that though he welcomed the initiative, he still had reservations.